Multiplex circuit with time delay for stabilization

Abstract

A multiplex circuit for use with a plurality of measuring devices, each of which require a period of stabilization before providing an accurate measurement, includes a plurality of measuring stages. Each stage is connected in cascade to an adjacent stage and includes a measuring device, readout means and a timing circuit which activates the readout means a predetermined interval after the measuring device is turned on.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 
     
       1. A multiplex circuit for use with a plurality of measuring means which require a period of stabilization after activation, said circuit including a plurality of measuring stages, each stage having at least one measuring means, readout means and timing means, said timing means including first, second and third timers, said first and second timers having a common input with the output of said first timer being connected to a measuring means, the output of said second timer being connected to the input of said third timer, with the output of said third timer being connected to a readout means, the elapsed operating time of said first timer being equal to the sum of the operating times for said second and third timers, with said second timer activating said third timer a predetermined interval after turn-on of said first and second timers, said measuring stages being connected in cascade, with the timing means of one stage being connected to activate the timing means of the successive stage.   
     
     
       2. The multiplex circuit of claim 1 further characterized by and including amplifier means connected in common between all of said measuring means and all of said readout means. 
     
     
       3. The circuit of claim 1 further characterized in that each of said readout means includes a relay and at least one output circuit, a common amplifier connected to all of said relays and to all of said measuring means.